Reading Piston Tops

BigSkyBigSky Posts: 343Senior Contributor
Anyone know what the readings on this piston may mean?  


  • BigSkyBigSky Posts: 343Senior Contributor
    I think I found some answers....

  • Ric West INRic West IN Posts: 453Senior Contributor
    D is the code for piston diameter. 10/3 is the weight in oz. or 10 and 3/4 oz.
    Pistons are numbered as to which cylinder the piston was originally installed.  The 3 digit number should match the 1st 3 digits of the motor number . Making sure the pistons were installed in the correct block.  This info from my 1942-1947 shop manual.
  • Hudson_in_SeattleHudson_in_Seattle Posts: 173Member
    obviously, someone fed a whole bunch of old movable type into the intake - glad they shot out the exhaust . . . and hopefully someone has the real answer!
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